They are equally precise, as we know exactly the conversion factor between inches and feet.
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20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.
Seven yards is more than 21 feet. One yard equals 3 feet, so 7 yards equals 21 feet. Therefore, 7 yards and 21 feet are equal in length.
189 Get 210 to be safe.
21 inch
21 feet by 21 feet is a square having an area of 441 square feet.